Technique for protection of new shafts over 1000-m-deep with small- sized safe pillar and anti-deformation technique
Abstract：To solve the problem of huge coal protective pillar induced by new shaft in deep depth area, the methods for the design of small-sized safety pillars were proposed based on the result of field experiment, numerical simulation cal- culation and theoretical study. The safe pillars were so designed as to be able to effectively reduce the deformation of the shafts and ensure the stability and symmetry of pillars. Force and deformation law of new shaft protected by small- sized safe pillar was analyzed by numerical simulation, some problems needing attention in the shaft protection were proposed. A systematic study was made on the techniques for increasing the shafts＇ deformation-resistant capability through making overall planning and using rigid and flexible structural measures to effectively absorb and resist the movement and deformation of strata. As evidenced by practical result for the protection of a pair of new anti-deforma- tion downcast and upcast shafts at the No. 4 Coal Mine under Pingdingshan Tian＇ an Coal Mining Co. , Ltd. , the design of the safe pillars and the anti-deformation techniques adopted for protection of the 2 shafts have achieved remarkable teehno-economical effects.
Keywords：new shaftsmall safe coal pillaranti-deformation techniqueforce analysis
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 1281-1284 )